Efficient sludge energy treatment method based on hydrothermal pretreatment

A treatment method and high-efficiency energy technology, applied in pyrolysis treatment of sludge, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of reduced thermal sludge gasification effect, and reduce energy consumption and Chemical cost, carbon emission reduction, dehydration performance improvement effect

Active Publication Date: 2020-04-17
TONGJI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

With the further increase of the moisture content of the sludge, the sludge gasification effect is reduced due to the large amount of heat consumed by the evaporation of water in the sludge.

Method used

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  • Efficient sludge energy treatment method based on hydrothermal pretreatment
  • Efficient sludge energy treatment method based on hydrothermal pretreatment

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preparation example Construction

[0045] The pyrolysis gasification of the dewatered sludge and the preparation of the catalyst are carried out simultaneously. The iron-containing conditioner and biochar conditioner remaining in the mud cake are evenly distributed inside the sludge particles, increasing the content of Fe, C and other elements in the sludge, and its effects from two aspects:

[0046] In the preparation of hydrogen-rich gas fuel, iron salt can effectively increase the reaction rate of sludge gasification, biochar can supplement the C source and increase the CO, CH 4 and other gas production. Higher active biochar can promote the breaking of carbon-hydrogen bonds and carbon-carbon bonds on the surface of sludge particles, promote the transformation of macromolecular organic matter into small molecular gases, and promote the formation of voids in particulate matter, increasing the specific surface area of ​​sludge particles. At the same time, biochar can catalyze the cracking of pyrolysis oil, pr...

Embodiment 1

[0049] The dewatered sludge of a sewage treatment plant has a measured solid content of 10%. Put 80kg of sludge in the sludge storage tank into the inner tank of a hydrothermal reaction kettle with an effective volume of 100L. The set temperature is 180°C and the pressure is 1MPa, maintain 30min after reaching the set temperature, water vapor is recovered and used to preheat the sludge in the sludge storage tank, the solid content of the sludge is reduced to 6% after hydrothermal treatment, and solid FeSO is added to the sludge after hydrothermal treatment 4 , the dosage is 2% of the dry weight of the sludge, mixed evenly and stirred for 10 minutes; then add 0.15g / g (DS) biochar produced by subsequent pyrolysis and gasification, and the water content of the mud cake obtained after dehydration by plate and frame filtration The filtrate enters the anaerobic digestion system to produce methane and collect biogas, and the wet mud cake produced enters the sequencing batch fixed-bed ...

Embodiment 2

[0051] The dewatered sludge of a sewage treatment plant has a measured solid content of 20%. The sludge is semi-continuously entered into a hydrothermal reactor with a temperature of 200°C and a pressure of 1.6MPa through a high-pressure pump. After reaching the set temperature Maintained for 60 minutes, water vapor was recovered and used to preheat the sludge in the sludge storage tank. It was measured that the solid content of the sludge after hydrothermal modification was reduced to 15%, and solid FeSO was added to the sludge after hydrothermal treatment 4 , the dosage is 5% of the dry weight of the sludge, mixed evenly and stirred for 10 minutes; then add 0.27g / g (DS) of biochar produced by subsequent pyrolysis and gasification, and the moisture content of the mud cake obtained after dehydration by plate and frame filtration The reaction material enters the dehydration system after multi-stage decompression cooling, the dehydration filtrate enters the anaerobic system for s...

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Abstract

The invention relates to an efficient energy treatment method for sludge based on hydrothermal pretreatment. The method comprises the following steps: 1, performing hydrothermal pretreatment on sludgegenerated by a sewage treatment plant and having a solid content of 5-20%; 2, feeding filter residues obtained by dewatering into a pyrolysis and gasification system, converting, and performing pyrolysis gasification treatment on the sludge by taking water vapor generated by sludge hydrothermal treatment and moisture existing in the dehydrated sludge as gasification agents to obtain hydrogen-richgas, pyrolyzed oil and biochar, wherein the pyrolysis retention time is 60 minutes, and the used carrier gas is N2; and 3, collecting and conveying the filtrate after dewatering treatment, and carrying out anaerobic digestion treatment to obtain biogas. The method has the advantages that sludge is subjected to hydrothermal pretreatment to be liquefied or partially carbonized so as to achieve theefficient separation of the solid phase and the liquid phase in the sludge, and the hydrogen-rich gas fuel and the catalyst are prepared through catalytic gasification of the solid phase.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling, in particular to a high-efficiency sludge energy treatment method based on hydrothermal pretreatment. Background technique [0002] With the continuous improvement of China's industrialization and urbanization level, the discharge of urban sewage has increased year by year. In addition, China's sewage treatment has been strengthened, and the sewage discharge standards have become more stringent. As of the end of December 2017, the treatment capacity of urban sewage plants across the country has reached 182 million cubic meters per day. Sludge is the largest by-product produced in the sewage treatment process, and the national sludge output has reached 8.084 million tons (dry basis). Since sludge contains a large amount of organic matter, pathogenic bacteria, heavy metals, inorganic substances, etc., how to effectively and safely treat sludge has become a research hotspot for scholar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/10C02F11/122C10J3/00
CPCC02F11/10C02F11/122C10J3/00C10J2300/0946C10J2300/0973C02F11/143Y02W10/40Y02P20/10
Inventor 董滨陈仁杰邱瞧清李昕陈思思沈丹妮戴晓虎
Owner TONGJI UNIV
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